What does [Exposed] mean on [LegacyNoInterfaceObject] interfaces?

[saschanaz]

Currently the spec allows [Exposed] and [LegacyNoInterfaceObject] coexist with Example 74, while [Exposed] is optional in such case.

What does it mean to have both, though?

[annevk]

The way I see [Exposed] is as a list of globals/realm that can have instances of the object "present in them". And the other is really about whether the global object has a property pointing toward the constructor.

[saschanaz]

Makes sense, but then does [LegacyNoInterfaceObject] alone implicitly mean [Exposed=Everywhere]?

[annevk]

I strongly suspect it appearing alone to be an error. I thought we required Exposed. If we don't, we should.

[saschanaz]

We don't, #423 somehow allowed omitting it.

https://github.com/heycam/webidl/blob/6bccbcaf3a22c658e342fb032ebac7cc24c7836f/index.bs#L1019-L1021